How could it be only 140 years old? It took longer than that for the light to arrive at Earth. This tar is close to the center of the galaxy?
It wouldn’t be in color if it were any older.
I think it’s saying that astronomers are detecting X-rays given off 140 years after the supernova occurred.
optical center, not physical center.......
Well, it's like you walk into a movie and you look at the screen, and you say, "Gee, it looks like I missed the first 140 years."